Syn- and post-sedimentary controls on clay mineral assemblages in a tectonically active basin, Andean Argentinean foreland
In the northern part of the Calchaquí Valley (NW Argentina), Palaeogene Andean foreland sediments are represented by a 1400-metre-thick continental succession (QLC: Quebrada de Los Colorados Formation) consisting of claystones, siltstones, sandstones, and conglomerates representing sedimentation in...
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2014
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| 003 | AR-BaUEN | ||
| 005 | 20230518204440.0 | ||
| 008 | 190411s2014 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-84896890148 | |
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| 100 | 1 | |a Do Campo, M. | |
| 245 | 1 | 0 | |a Syn- and post-sedimentary controls on clay mineral assemblages in a tectonically active basin, Andean Argentinean foreland |
| 260 | |c 2014 | ||
| 270 | 1 | 0 | |m Do Campo, M.; INGEIS (CONICET - Universidad de Buenos Aires) y FCEyN, U.B.A. Pabellón INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina; email: docampo@ingeis.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a In the northern part of the Calchaquí Valley (NW Argentina), Palaeogene Andean foreland sediments are represented by a 1400-metre-thick continental succession (QLC: Quebrada de Los Colorados Formation) consisting of claystones, siltstones, sandstones, and conglomerates representing sedimentation in fluvial-alluvial plains and alluvial fan settings. To understand the main syn- and postsedimentary variables controlling the clay mineral assemblages of this succession, we have studied the fine-grained clastic sediments by X-ray diffraction and electron microscopy, along with a detailed sedimentary facies analysis, for two representative sections. In the northern section, the whole succession was sampled and analysed by XRD, whereas in the second section, a control point 15km to the south, only the basal levels were analysed. The XRD study revealed a strong contrast in clay mineral assemblages between these two sections as well as with sections in the central Calchaquí Valley studied previously. In the northernmost part of the study area, a complete evolution from smectite at the top to R3 illite/smectite mixed-layers plus authigenic kaolinite at the bottom, through R1-type mixed-layers in between, has been recognized, indicating the attainment of late diagenesis. In contrast, the clay mineral assemblages of equivalent foreland sediments cropping out only 15km to the south contain abundant smectite and micas, subordinate kaolinite and chlorite, and no I/S mixed-layers to the bottom of the sequence. Early diagenetic conditions were also inferred in a previous study for equivalent sediments of the QLC Formation cropping out to the south, in the central Calchaquí Valley, as smectite occurs in basal strata. Burial depths of approximately 3000m were estimated for the QLC Formation in the central and northern Calchaquí Valley; in addition, an intermediate to slightly low geothermal gradient can be considered likely for both areas as foreland basins are regarded as hypothermal basins. Consequently, the attainment of late diagenesis in the northernmost study area cannot be explained by significant differences in burial depth nor in geothermal gradient in relation to the section 15km to the south nor with the central Calchaquí Valley. The formation of R3 mixed-layer I/S and authigenic kaolinite in the northern study area was most likely controlled by the circulation of hot, deep fluids along the reverse faults that bounded the Calchaquí valley. These faults were active during the Cenozoic, as evidenced by the syndepositional deformation features preserved in the studied sediments. Stress could also have been a driving force in burial diagenesis at the R3 mixed-layer I/S stage in these young continental sediments. © 2014 Elsevier Ltd. |l eng | |
| 536 | |a Detalles de la financiación: A/7712/07 | ||
| 536 | |a Detalles de la financiación: CGL2011-30153-C02-01, PIP 489, ANCyT - PICT 0407 | ||
| 536 | |a Detalles de la financiación: This work was partially financed by CONICET - PIP 489 and ANCyT - PICT 0407 grants and Research Project CGL2011-30153-C02-01 (Spanish Ministry of Science). The stay of M. Do Campo at the University of Granada and the field work of Fernando Nieto in Argentina were supported by AECI project A/7712/07. The authors are grateful to G. Giorgetti and an anonymous reviewer for their valuable and constructive comments. We also thank Christine Laurin for revising the English text. | ||
| 593 | |a INGEIS (CONICET - Universidad de Buenos Aires) y FCEyN, U.B.A. Pabellón INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina | ||
| 593 | |a Departamento de Mineralogía y Petrología and I.A.C.T., Universidad de Granada - CSIC, Avda. Fuentenueva s/n, 18002 Granada, Spain | ||
| 593 | |a CICTERRA, CONICET - Universidad Nacional de Córdoba, Córdoba, Argentina | ||
| 593 | |a IBIGEO (CONICET - Universidad Nacional de Salta), Avda. Bolivia 5150, 4400 Salta, Argentina | ||
| 690 | 1 | 0 | |a DIAGENESIS |
| 690 | 1 | 0 | |a FORELAND BASINS |
| 690 | 1 | 0 | |a ILLITE/SMECTITE MIXED-LAYERS |
| 690 | 1 | 0 | |a KAOLINITE |
| 690 | 1 | 0 | |a CENOZOIC |
| 690 | 1 | 0 | |a DIAGENESIS |
| 690 | 1 | 0 | |a FACIES ANALYSIS |
| 690 | 1 | 0 | |a FORELAND BASIN |
| 690 | 1 | 0 | |a GEOTHERMAL GRADIENT |
| 690 | 1 | 0 | |a ILLITE |
| 690 | 1 | 0 | |a KAOLINITE |
| 690 | 1 | 0 | |a PALEOGENE |
| 690 | 1 | 0 | |a SEDIMENTATION |
| 690 | 1 | 0 | |a SMECTITE |
| 690 | 1 | 0 | |a TECTONIC EVOLUTION |
| 690 | 1 | 0 | |a TECTONIC SETTING |
| 690 | 1 | 0 | |a X-RAY DIFFRACTION |
| 690 | 1 | 0 | |a CALCHAQUI VALLEYS |
| 690 | 1 | 0 | |a MICAS |
| 651 | 4 | |a NW ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a Nieto, F. | |
| 700 | 1 | |a del Papa, C. | |
| 700 | 1 | |a Hongn, F. | |
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